Actually some people have tried. I don't have any links, but I might be able to dig them up if you REALLY want to.
Anyway, the gist of it is that they don't OC well. To my knowledge, Turion 64's do not scale well to high clocks. AMD used thicker gates to reduce current leakage and as a result "slower" transistors that do not switch quickly. I think people were having trouble breaking 2.5GHz on a 2GHz chip; which isn't bad, but not worth it IMO.
I see little reason to go S754, unless you're getting a deal
